DevTools Logo

TLS Handshake Simulator

TLS Handshake Simulator

Educational TLS 1.2 flow — no network, no real certificates

Client

Browser / app

Server

TLS endpoint

  1. ClientHello
  2. ServerHello
  3. Certificate
  4. ServerHelloDone
  5. ClientKeyExchange
  6. ChangeCipherSpec + Finished

About this tool

Watch TLS 1.2 handshake messages animate between client and server — ClientHello through Finished. Purely educational; no sockets and no certificates fetched from the internet.

Frequently asked questions